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Hi,
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I don't have this particular phone, but generally the sim card in under the battery. Before you start, make sure you have all your contacts and stuff stored on the phone, not the sim, or it all goes bye-bye when you change the sim. Snap off the back of the phone. Don't pry the battery out. Usually you have to look for 2 tiny little "latches" that hold it in. Sometimes there is a lever that you push to release the battery. Then you can see the sim card. Sometimes you release a little metal clip that holds it down. On other phones, you just slide the card out from under the metal holder. Pay attention to which way the card is turned, and don't put the new one in upside down. Then reassemble the phone.

Hi reachmehe822 I not sure which phone you have. Now her is a few universal steps you can do. One take the battery and sim card out of the phone. Two clean out of speakers and mic ports. Three take a toothbrush and a can of air to clean the phone. Don't spray the air to long in your ports. Next do not spray to long in the speakers or mic. Now if your can gets cold let it warm up for 5-10 mins. Now I would but the sim card in first then the battery. You should be able to hear out of the phone. Hope this help.

Hi, issues like this are related to your Sim card (network), not your Cell Phone . In most cases, regarding the text messages, the problem is from the Service Operator. Have you tried the Sim card on another phone? If not, remove the Sim card, insert it on another phone and try sending a message from another mobile to you number, or you can do it in vise- versa by inserting another Sim card on your mobile.

If you can't receive text messages even when it's inserted on another handset, then you will need to call the customer care of your Network Operator and tell them your problem, they will help you fix it immediately.

You can check the message center number, but I don't think it's very much important in your case, well, if you wanna try, just check the text message settings and verify that the message center number (which is currently in use) is the same number which is on another phone with the same network (the other Sim should be of the same network in your area). If it's different, make the changes and save the settings. Also disable the "Receive Via" or similar settings.. (I can't recollect the exact settings as i don't have the same model with me, please excuse me for this.).

If the same Sim card doesn't receive text messages using another handset, don't bother to change the settings or to make any changes with it, first call the customer care and verify from them, you may make mistakes instead of fixing it.

Hi, issues like this are related to your Sim card (network), not your Cell Phone . In most cases, regarding the text messages, the problem is from the Service Operator. Have you tried the Sim card on another phone? If not, remove the Sim card, insert it on another phone and try sending a message from another mobile to you number, or you can do it in vise- versa by inserting another Sim card on your mobile.

If you can't receive text messages even when it's inserted on another handset, then you will need to call the customer care of your Network Operator and tell them your problem, they will help you fix it immediately.

You can check the message center number, but I don't think it's very much important in your case, well, if you wanna try, just check the text message settings and verify that the message center number (which is currently in use) is the same number which is on another phone with the same network (the other Sim should be of the same network in your area). If it's different, make the changes and save the settings. Also disable the "Receive Via" or similar settings.. (I can't recollect the exact settings as i don't have the same model with me, please excuse me for this.).

If the same Sim card doesn't receive text messages using another handset, don't bother to change the settings or to make any changes with it, first call the customer care and verify from them, you may make mistakes instead of fixing it.

If you used a same SIM card for those phones, I think its signal problem, when signal is low the connection will be disturbed sometime as no sound or cut suddenly during call conversation. Try to use different SIM card provider, with stronger signal will better, then put in these device. If the problem solved then its operator signal problem. The solution is change the SIM card.But if you have try to change with other SIM card with stronger signal but people still can't hear you, then its microphone problem. You need to repair or replace your phone's microphone.

Your problem is with the mic, probably it's not working anymore or maybe it's been displaced or wiring problem. It's better for you to get it repaired from a mobile repairing shop. You might make mistakes if you don't have enough idea with it. They'll replace the mic and the problem will be fixed. Good luck
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the whistle could be from teh sim-card take it out and place it into another mobile if you do not hear the sound anymore have the sim-card replaced.....as for the ear piece take the phone to a mobile service center or professional mobile technician to hvae it replaced.

I think the problem is your phone has some settings that disabled your SMS functions so I suggest you to try and put your SIM card in another phone and try sendng SMS. If it works, try Reset Settings from the K800i. If it doesn't work, try changing a SIM card from your service provider.